I used Rumpf head cement for over 40 years with no problems. I am not able to get it any more so I switched to Waspi. It seems to leave a sheen on the colored thread and not as glossy. Also I tried some water based material and did not like it.I checked with some other tiers and they have problems with Waspi also. One guy buys 12 bottles at a time and said the same thing. He called Waspi and they said it was a bad batch and would replace it. Years ago I used Sally Hansen hard as nails nail polish and liked it. I just got a bottle and worked fine. Problem is when using it on small flys the brush is too big and sloppy. I could remove the brush and use a dubbing needle. I just got a second bottle and will check it out to be sure it works to my satisfaction then remove it. Anyone else experiencing this?

